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API Cast and forged steel gate valve is a fluid conveying system, a cut-off, regulation, guide, to prevent the reverse flow, the function such as voltage, the leakage of the shunt or overflow. Used for fluid flow control system valve system, from the most simple of American standard cut-off valve to the extremly complex control system used in all kinds of American standard valve, its quite a wide varieties and specifications. The valve can be used to control air, water, oil, steam, all kind of corrisive medium, mud, liquid metal and radioactive medium such as various types of fluid flow.